Rolling machine



K'. KRE YER. ROLLING MACHINE.

APPLICATION FILED SEPT. 30, 1915 1,408,608. Patented Mar, 7,1922.

UNITED STATES PATENT OFFICE.

ROLLING MACHINE.

Specification of Letters Patent Patented Mar. '7, 1922.

Application filed September 30, 1915. Serial No. 53,347.

(GRANTED UNDER THE PROVISIONS OF THE ACT 0F MARCH 3, 1921, 41 STAT. L,1313.)

To all whom it may concern:

Be it known that I, KARI KREYER, a subject of the German Emperor, andresiding at Dusseldorf, Germany, have invented certain. new and usefulImprovements in Rolling Machines; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to improvements in rolling devices, the chiefobject being to effect a graduated retardation of the workpiece holderas it approaches the end of its stroke and thereby avoid shocks andfacilitate its return for the next working stroke.

According to this invention, the device comprises a cylinder containinga fluid operated piston connected to the work-piece, the arrangementbeing such that pressure fluid is admitted to the respective sides ofthe piston so that the differential pressure thereon is graduallyreduced as the piston approaches the end of its working stroke.

In order that. the said invention, may be clearly understood and readilycarried into effect the same will now be described more fully withreference to the accompanying drawings, in which Figure 1 is alongitudinal section of the device, and

Figures 2 and. 3 show details thereof in. section.

(.I- is a cylinder provided with an inlet 6, in a piston working thereinand connected to a mandrel h by means of a piston j and a connectingpiece 2'. The workpiece g is placed on the mandrel h and is acted uponby the rollers w and 2 The front and the rear ends of the cylinder areconnected by the conduits c and Z). The conduit 0 is controlled by avalve f so constructed that its valve body a is acted upon by aspring-25 which abuts against a plate 8 fixed to one end of a spindleTlns valve-spindle q is screw-threaded and can, therefore, be adjustedin the valve case (Fig. 3).

The conduit 6 is controlled by a valve (Z (Fig. 2) of a constructionsimilar tothat of the valve f. The valve d is provided with anadjustable spindle on having an enlargement or plate a, this plate beingacted .upon by a spring p arranged between the plate a and the valvebody 0.

In the position shown in Figure 1, the motive fluid (viz: compressedair) on entering the inlet 6 acts on the piston 70 to cause it to movethe work piece 9 to the rlght, i. e. into operative position withrespect to the rollers m, y.

This forward movement of the piston and the work piece can be effectedonly after the work piece is released by the projecting parts of therollers pressing upon it. As soon as the work piece is released thepiston 70 slides forward and moves the work piece 9 to the right. Beforethis movement takes place, however, a portion of the motive fluid entersthe cylinder at the rear of the piston la, owing to the fact that thepressure of the air in that part of the cylinder is lower than thepressure of the motive fluid in consequence of a suction caused by thepreceding backward movement of the piston 7:. The motive fluid passesthrough the conduit 0 and the valve 7 overcoming the resistance offeredby the spring t and the weight of the valve body a, and forms a cushionat the rear of the piston 70. As the piston it approaches the end of itsworking stroke, the pressure of the cushion increases until itcounterbalances the pressure of the motive fluid. In the event of thepressure at the rear of the piston exceeding that of the motive fluidacting on the front of the piston, the cushioning fluid at the rear ofthe piston is allowed to escape through the valve (Z.

By suitably adjusting the valves, i. e. by varying the weights of thevalve plates and adjusting the tensions of the springs, it is possibleto regulate the pressure of the cushion at the beginning and end of thestroke, and thereby the speed of the work piece in its forward movementcan be made to accord with the rotary speed of the rollers.

A further advantage of this invention lies in the fact that thecushioning fluid is re turned to the working side of the piston, so thatnone of the motive fluid is wasted.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is 1. In a rolling device, the combination of acylinder, 21 fluid operated piston therein which is connected to thework piece,v means for admitting motive fluid from one side of saidpiston to the other to form a fluid pressure cushion in said cylinder,and means for leading fluid from said. other side of the piston out ofthe cylinder when said. fluid pressure cushion exceeds a predeterminedpressure.

2. In a rolling device, the combination of a cylinder, a fluid operatedpiston therein which is connected to the work-piece, a conduitconnecting the front and rear ends of the cylinder at opposite sides ofthe piston, an adjustable valve located in said conduit for controllingthe flow 0t motive fluid therethrough, means providing an outlet fromsaid rear end of the cylinder, and an adjustable valve controlling saidoutlet means.

3. In a rolling device, the combination of a cylinder, a fluid-operatedpiston therein which is connected to the Work-piece, means for leadingfluid from one side of said piston to the other to form a fluid-pressurecushion in said cylinder, and means for lead ing [fluid from said otherside of the piston back to the first mentioned side of said piston.

l, In a rolling device, the combination of a cylinder, a fluid-operatedpiston therein which is connected to the Work-piece, a conduitconnecting both ends of the cylinder at opposite sides of the piston, anadjustable spring-pressed valve located in said conduit .)Q1.ll'1lttlngof the flow of pressure fluid from the working side of the piston to therear thereoi a second conduit connecting both ends of the cylinder atopposite sides of the piston, and an adjustable spring-pressed valvelocated in said second conduit and permittingof the return of thepressure fluid to the working side of the piston.

In testimony whereof, I aiiix my signature, in presence of twoWitnesses.

KARL KREYER.

Witnesses i J. D. ZIESECK, GIVENNIE OBERGETHMANN.

